Technology tree? – Merchant Review

Hard to figure out what you need to advance your buildings... Manuals are missing the limitations based on experience level. Gets quite annoying quickly. Manual says I "need one building of level 2 to build it" but the option to build does not come up even after I have a number of lv3,4 buildings.... Why should I play this if all I can do is produce basic stuff forever?
Review by Bad__Ass on Merchant.